Consequences of hacking and griefing on a minecraft account?

Your account gets banned from multiplayer!

it starts off with server bans. Then you get on the right server that is running the right tools that builds a report sheet for you and eventually it WILL catch up to you.

Well, it's not ethical to do that, unless the victim has done something to you.

Normally low-lifes only do that sort of thing.

You will get banned on minecraft servers for hacking and griefing (Breaking Rules)